The Brokerage Founder Was the First Woman Member of the New York Stock Exchange

Muriel Siebert, the first woman member of the New York Stock Exchange and a well-known brokerage founder and executive, died Saturday due to complications from cancer. She was 80 years old.

Ms. Siebert was known across Wall Street as "Mickie." An outspoken advocate for financial literacy and for women's advancement on Wall Street, she often did that both through encouraging others and bucking a system intent on keeping...